code: def predict_on_batch(self, x):
      return self.model.predict_on_batch(x)
  
imports: import numpy
  from bigdl.optim.optimizer import MaxEpoch
  from zoo.tfpark.utils import evaluate_string_metrics
  from zoo.common import enable_multi_fs_save, enable_multi_fs_load
  from zoo.common.nncontext import getOrCreateSparkContext
  from zoo.tfpark.tf_dataset import TFNdarrayDataset, TFDataset, _standarize_feature_label_dataset, check_data_compatible
  from zoo.tfpark.tf_optimizer import TFOptimizer
  from zoo.tfpark.tf_predictor import TFPredictor
label_desc: Use image node_id 18 for calling the KerasModel obj's underlying member method code with example usage: obj.predict_on_batch(x) and returns: self